This may not generate much excitement from you advanced users, but I have known some pretty hot players that didn't know much about the "Jump" button.
All of the newer Ketron keyboards and modules have the "Jump" button and it is a cool little button.
If the button is off you can change your arrangements (A-D) normally. If you play a fill, you get no effect. However, if the "Jump" button is on pressing a fill causes the arrangement to change. (with some exceptions) On the "X" and the "SD" series, pressing fill 1 or fill 2 button causes the arranger to move from A-B, B-C, C-D, D-A and around and around. I think of it going in a "clockwise direction". Fill 3 causes the arranger to move in the opposite direction. The "break" fill is one exception and it causes no change.
Here is another cool function. If the "Jump" button is off, the Intros and Endings work normally. However if the "Jump" button is on, they work in reverse. So that in the middle of a song you could hit Intro/Ending 1,2 or three and the Intro would play. This is sometimes a nice interlude to a song and give a nice flow and sense of dynamics to the music. One thing that is different on the XD series is that the Jump button is split. You can have it work just with the fills or just with the intros/endings or all.
If you are using a FS6 or FS13 footswitch, You can assign "Jump" to one of the switches and get rid of two arrangements on the switches. So instead of using four switches for arrangements A, B, C and D you can set A and D or A and C, and then you are only one fill away from the other arrangement if the "Jump" function is turned on.
On the older "MS" series the principle is the same. You just have one fewer fill so the "back jump" is on fill 2 instead of fill 3.
If anyone has any other cool tricks on the "Jump" button they would like to share, send an email with a complete description and I will be happy to pass it along with full credit to whoever sends it in.